在收缩率大的塑料制品模具中，应沿其（）方向设置冷却回路。A.膨胀 B.流线 C.收缩

阅读理解。

     It seems to be strange to you there is a blind spot on the eye. Here is an interesting experiment that can

make something disappear, When one eye is open?

     Make a card about the size of a postcard and write two English letters L and R on it. L on the left and R

on the right. first, hold the card about 80 cm away and you see both the letters. Then close your right eye

and look at the letter R only with your left eye. And now, as you move the card slowly towards you, you'll

see the letter L disappearing. But if you move the card nearer to your lace, the letter will be seen again. Now

do the same experiment with your left eye closed, you'll see the letter R disappearing.

     Why did the letter disappear? It is because there is a blind spot on the eye. When the image of the letter

falls on the blind spot, it won't be seen. That is why either of the letters disappear.

1. The word"disappear" in the first paragraph means _____. [ ]

A. 消散

B. 丢失

C. 消失

D. 遗失

2. You fail to see the letter "L" in the experiment because _____. [ ]

A. your eyes are poor

B. you move it close to your eye

C. its image falls on the blind spot

D. your left eye is not open

3. In which order (顺序) should you do the experiment?

a. hold the card

b. move the card nearer

c. close your right eye

d. write two English letters

e. look at the letter R

f. make a card [ ]

A. f-d-a-b-c-e

B. a-c-f-d-e-b

C. f-a-d-c-b-e

D. f-d-a-c-e-b

4. This passage mainly (主要) tells us _____.[ ]

A. there is a blind spot on the eye

B. an interesting experiment

C. where the blind spot is

D. how to find the blind spot

国家对落后的耗能过高的用能产品、设备和生产工艺实行淘汰制度。生产过程中耗能高的产品的生产单位，应当执行（）。

A.单位产品能耗限额标准

B.节能评估和审查制度

C.节能目标责任制

D.强制性节能标准

中华人民共和国计量法实施的时间是（）

A.1985年9月6日

B.1987年6月1日

C.1987年9月6日

D.1985年6月9日

E.1992年7月1日

某班级同学查阅资料，对Na₂S有了一定的认识，并提出了以下几个问题，请回答：

(1)1000℃时，在密闭容器中加入一定量的Na₂SO₄固体使其发生以下反应达到平衡：

Na₂SO₄(s)＋4H₂(g) Na₂S(s)＋4H₂O(g)　ΔH>0若反应在恒温恒容状态下进行，回答以下问题：

向容器中分别加入以下物质，判断对平衡有无影响，有影响的填写出平衡移动的方向。

①加入Na₂SO₄　　　　　。②加入焦炭　　　　　　　　　　　。

(2)向Na₂S的浓溶液中逐滴加入稀盐酸，直到不再生成H₂S气体为止，则在此过程中，溶液的c(HS^－)变化趋势可能是　　　。

a.逐渐减小             b.逐渐增大

c.先逐渐增大，而后减小  d.先逐渐减小，而后增大

(3)Na₂S溶液与下列溶液混合，不能发生反应的是　　　　。

①H₂S　②SO₂　③Na₂SO₃　④酸性KMnO₄溶液　⑤CuSO₄  ⑥氯水

(4)写出Na₂S和AlCl₃溶液反应的离子方程式　　　　　　　　　　　　。

前葡萄膜炎时KP分布类型有（）

A.晶状体前囊

B.角膜后弥漫分布

C.三角形

D.角膜瞳孔区

E.虹膜实质